test: Unit test fixing of TestEventlogManager_UpdateSegmentReplicas

[wenfengwang]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary

Unit test fixing of TestEventlogManager_UpdateSegmentReplicas

What is changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

[codecov]

Codecov Report

Merging #467 (3e24de2) into main (2a78cb5) will decrease coverage by 0.58%.
The diff coverage is 41.57%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #467      +/-   ##
==========================================
- Coverage   57.71%   57.13%   -0.58%     
==========================================
  Files         180      185       +5     
  Lines       14614    15051     +437     
==========================================
+ Hits         8434     8599     +165     
- Misses       5552     5819     +267     
- Partials      628      633       +5     

Impacted Files	Coverage Δ
...ernal/controller/trigger/validation/subscripton.go	69.29% <ø> (+0.85%)	⬆️
internal/gateway/proxy/deadletter.go	0.00% <0.00%> (ø)
internal/gateway/proxy/direct.go	73.33% <0.00%> (-5.24%)	⬇️
internal/store/segment/server.go	14.10% <0.00%> (-0.03%)	⬇️
internal/trigger/client/gcloud_functions.go	0.00% <0.00%> (ø)
internal/trigger/client/grpc.go	0.00% <0.00%> (ø)
internal/trigger/client/http.go	0.00% <0.00%> (ø)
internal/trigger/client/interface.go	0.00% <0.00%> (-19.24%)	⬇️
internal/trigger/client/lambda.go	0.00% <0.00%> (ø)
internal/gateway/proxy/proxy.go	23.08% <6.52%> (-2.01%)	⬇️
... and 31 more

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